Hemodynamic mechanisms of the attenuated blood pressure response to mental stress after a single bout of maximal dynamic exercise in healthy subjects
Braz. j. med. biol. res
;
45(7): 610-616, July 2012. tab
Article
Dans Anglais
| LILACS
| ID: lil-639468
ABSTRACT
To determine the hemodynamic mechanisms responsible for the attenuated blood pressure response to mental stress after exercise, 26 healthy sedentary individuals (age 29 ± 8 years) underwent the Stroop color-word test before and 60 min after a bout of maximal dynamic exercise on a treadmill. A subgroup (N = 11) underwent a time-control experiment without exercise. Blood pressure was continuously and noninvasively recorded by infrared finger photoplethysmography. Stroke volume was derived from pressure signals, and cardiac output and peripheral vascular resistance were calculated. Perceived mental stress scores were comparable between mental stress tests both in the exercise (P = 0.96) and control (P = 0.24) experiments. After exercise, the blood pressure response to mental stress was attenuated (pre 10 ± 13 vs post 6 ± 7 mmHg; P < 0.01) along with lower values of systolic blood pressure (pre 129 ± 3 vs post 125 ± 3 mmHg; P < 0.05), stroke volume (pre 89.4 ± 3.5 vs post 76.8 ± 3.8 mL; P < 0.05), and cardiac output (pre 7.00 ± 0.30 vs post 6.51 ± 0.36 L/min; P < 0.05). Except for heart rate, the hemodynamic responses and the mean values during the two mental stress tests in the control experiment were similar (P > 0.05). In conclusion, a single bout of maximal dynamic exercise attenuates the blood pressure response to mental stress in healthy subjects, along with lower stroke volume and cardiac output, denoting an acute modulatory action of exercise on the central hemodynamic response to mental stress.
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Stress psychologique
/
Épreuve d'effort
/
Hémodynamique
Limites du sujet:
Adulte
/
Femelle
/
Humains
/
Mâle
langue:
Anglais
Texte intégral:
Braz. j. med. biol. res
Thème du journal:
Biologie
/
Médicament
Année:
2012
Type:
Article
Pays d'affiliation:
Brésil
Institution/Pays d'affiliation:
Universidade Federal Fluminense/BR
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